removing ThirdPartyNotice.txt from content and contentfiles folders (#3864)

Author: philipthomas-MSFT

Microsoft.Azure.Cosmos/src/Microsoft.Azure.Cosmos.csproj

@@ -59,7 +59,7 @@
 	</ItemGroup>
 
 	<ItemGroup>
-		<Content Include="..\..\ThirdPartyNotice.txt" Link="ThirdPartyNotice.txt" />
+		<None Include="..\..\ThirdPartyNotice.txt" Pack="true" PackagePath="" Visible="false" Link="ThirdPartyNotice.txt" />
 	</ItemGroup>
 
 	<ItemGroup>